A 29,000 kg freight car is coasting at 0.700 m/s with negligible friction under a hopper that dumps 150,000 kg of scrap metal into it. (a) What is the final velocity (in m/s) of the loaded freight car? (Enter the magnitude.)   (b) How much kinetic energy (in J) is lost?

A 31.0-kg skateboarder rides on a 10.0-kg skateboard at 5.7 m/s on a level road before jumping into air with a speed of 10.0 m/s against the ground in the direction of 27.0◦ above the forward, horizontal direction to leave the skateboard. Ignore air resistance and the friction between the road and skateboard.   What is the maximum height that the skateboarder can reach? (A) 1.05 m; (B) 1.25 m; (C) 1.45 m; (D) 1.65 m; (E) 1.85 m.   What is the speed of the skateboard on the ground after the jump? (A) 3.85 m/s; (B) 4.05 m/s; (C) 4.25 m/s; (D) 4.45 m/s; (E) 4.65 m/s.   What is the minimum work done by the skateboarder to make the jump? (A) 994J; (B) 974J; (C) 954J; (D) 934J; (E) 914J.

A 0.2 kg softball is thrown straight up with an initial speed of 9 m/s.  How high in meters does it go?  Round to two significant figures.

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